Support for Thrift Set type in Hive

[Satish Mittal <sa...@inmobi.com>]

Hi,

I am wondering if anyone has been able to get Thrift Set type working in
Hive.

Thrift supports List, Map and Struct complex types, which get mapped to
Array, Map and Struct complex types in Hive respectively. (Though there is
a difference in the support for Map: Thrift map allows a key of complex
type whereas Hive map doesn't.)

However thrift Set type doesn't seem to be working. Here is an example
thrift struct:

struct setrow {
    1: required set<i32> ids,
    2: required string name,
}

I created a Hive table using ThriftDeserializer as the serde class and
serialization.class is set to above thrift java class. However a describe
on this table shows type of column 'ids' as struct<>. Also issuing a select
query on set column throws SemanticException:
FAILED: SemanticException java.lang.IllegalArgumentException: Error: name
expected at the position 7 of 'struct<>' but '>' is found.

Any pointers/thoughts?

Thanks,
Satish

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